Influence of center-of-mass correlations on spontaneous emission and Lamb shift in dense atomic gases

Details Influence of center-of-mass correlations on spontaneous emission and Lamb shift in dense atomic gases Influence of center-of-mass correlations on spontaneous emission and Lamb shift in dense atomic gases

2000-02-07

arxiv.org/abs/cond-mat/0002095v1

Physics

Condensed Matter

10 pages, 2 figures

Scientific paper

Local field effects on the rate of spontaneous emission and Lamb shift in a dense gas of atoms are discussed taking into account correlations of atomic center-of-mass coordinates. For this the exact retarded propagator in the medium is calculated in independent scattering approximation and employing a virtual-cavity model. The resulting changes of the atomic polarizability lead to modifications of the medium response which can be of the same order of magnitude but of opposite sign than those due to local field corrections of the dielectric function derived by Morice, Castin, and Dalibard [Phys.Rev.A 51, 3896 (1995)].

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